The struggle over who can vote on Election Day is becoming more heated in courtrooms, judges’ chambers and statehouses across the country, paralleling the intensity of the presidential race. And at the moment, the side that wants fewer voting restrictions seems to be winning. The battle began in earnest after 2010, when several Republican state legislatures began tightening identification requirements on voters. It has reached a new level in the 2016 election, when voters in 17 states faced new restrictions that ranged from photo ID requirements to cutbacks on early voting and same-day registration. Republicans said the laws were necessary to prevent fraud; Democrats and voting rights advocates said the restrictions were really designed to reduce participation by minority groups and young voters who traditionally support Democrats. “It’s the biggest rollback of voting since Jim Crow,” said Jonathan Brater, an attorney at NYU Law’s Brennan Center for Justice, which compiled the list of restrictions.